Submission #1013839

#	Time	Username	Problem	Language	Result	Execution time	Memory
1013839		vjudge1	Triumphal arch (POI13_luk)	C++17	0 / 100	113 ms	25680 KiB

luk

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#include <bits/stdc++.h>
using namespace std;
#define endl "\n"
#define int long long
int n,arr[300001];
int depth[300001];
int fre[300001];
vector <int> v[300001];
void dfs(int i,int last,int cnt){
    depth[cnt]++;
    for(int j:v[i]) if(j!=last) dfs(j,i,cnt+1);
    return;
}
int calc(int k){
    for(int i=1;i<=n;i++) fre[i]=depth[i];
    int day=0,prog=1,crew=k,flag=1;
    for(int i=1;i<=n;i++){
        if(day==i) flag=0;
        while(fre[i]!=0){
            if(day==i) flag=0;
            if(fre[i]>crew){
                fre[i]-=crew;
                crew=0;
            }
            else{
                crew-=fre[i];
                fre[i]=0;
            }
            if(crew==0){
                day++;
                crew=k;
            }
        }
    }
    return flag;
}
signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    cin>>n;
    for(int i=0;i<n-1;i++){
        int a,b;
        cin>>a>>b;
        v[a].push_back(b);
        v[b].push_back(a);
    }
    dfs(1,0,0);
    int l=1,r=n,ans=1e9;
    while(l<=r){
        int k=(l+r)/2;
        if(calc(k)==1){
            ans=k;
            r=k-1;
        }
        else l=k+1;
    }
    cout<<ans<<endl;
    return 0;
}

Compilation message (stderr)

luk.cpp: In function 'long long int calc(long long int)':
luk.cpp:24:15: warning: unused variable 'prog' [-Wunused-variable]
   24 |     int day=0,prog=1,crew=k,flag=1;
      |               ^~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10